From 3e9cc2f3b7ddabbbfc9abd043887030c669380aa Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Sun, 21 Feb 2010 17:58:29 +0100 Subject: [PATCH] firewire: ohci: add module parameter to activate quirk fixes This way, we can advise users of precompiled kernel packages to test existing quirk fixes on chips which have not been listed yet, without them having to build a kernel from source. Note, to use this feature on a machine with more than one controller, steps like these are necessary: # lspci | grep 1394 # ls /sys/bus/pci/drivers/firewire_ohci/ # echo -n "0000:03:02.0" > /sys/bus/pci/drivers/firewire_ohci/unbind # echo 2 > /sys/module/firewire_ohci/parameters/quirks # echo -n "0000:03:02.0" > /sys/bus/pci/drivers/firewire_ohci/bind # echo 0 > /sys/module/firewire_ohci/parameters/quirks The parameter can also be used to switch off quirk flags that were hardwired into firewire-ohci's quirks table. Simply specify a non-zero quirks value but without any known flags, e.g. 0x100. Signed-off-by: Stefan Richter --- drivers/firewire/ohci.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 3dc2e8529a42..9815137b7c7d 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -246,6 +246,15 @@ static const struct { {PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_UNI_N_FW, QUIRK_BE_HEADERS}, }; +/* This overrides anything that was found in ohci_quirks[]. */ +static int param_quirks; +module_param_named(quirks, param_quirks, int, 0644); +MODULE_PARM_DESC(quirks, "Chip quirks (default = 0" + ", nonatomic cycle timer = " __stringify(QUIRK_CYCLE_TIMER) + ", reset packet generation = " __stringify(QUIRK_RESET_PACKET) + ", AR/selfID endianess = " __stringify(QUIRK_BE_HEADERS) + ")"); + #ifdef CONFIG_FIREWIRE_OHCI_DEBUG #define OHCI_PARAM_DEBUG_AT_AR 1 @@ -2370,6 +2379,8 @@ static int __devinit pci_probe(struct pci_dev *dev, ohci->quirks = ohci_quirks[i].flags; break; } + if (param_quirks) + ohci->quirks = param_quirks; ar_context_init(&ohci->ar_request_ctx, ohci, OHCI1394_AsReqRcvContextControlSet); -- 2.39.5